Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4610103.

Instead of using an external fan, I used a fan hat which controls the speed of the fan in relation to CPU temperature. Also printed with PETG.

https://www.amazon.com/gp/product/B07Y9LFP1J/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1